Abstract: A method of cutting a sheet material includes mounting the sheet material on a support and forming a porous barrier between the sheet material and the support by interposing at least one sheet of porous material between the sheet material and the support. The method includes focusing a laser beam at a target point relative to the sheet material on the support. A relative motion is effected between the focused laser beam and the sheet material such that the focused laser beam moves along a predetermined path on the sheet material to cut the sheet material along the predetermined path while the porous barrier shields the support from damage by the focused baser beam.

Abstract: This invention discloses a projection screen including a diffusion layer, a cap layer, an interference layer and an absorption layer. The projection screen of this invention is based on the concept of inverse reflection. The interference filter includes a plurality of high and low refractive index layers, both of which alternately stacked. The projection screen conveys a small spectral shift and a narrow bandwidth at different incident angles so that the better contract ratio of the image signal can be displayed.

Abstract: This invention discloses a projection screen including a diffusion layer, a cap layer, an interference layer and an absorption layer. The projection screen of this invention is based on the concept of inverse reflection. The interference filter includes a plurality of high and low refractive index layers, both of which alternately stacked. The projection screen conveys a small spectral shift and a narrow bandwidth at different incident angles so that the better contract ratio of the image signal can be displayed.